Rural lobby group AgForce says the current method of calculating leasehold land rents could force some Queensland graziers off the land.

AgForce chief executive officer Robert Walker says most of Queensland's grazing land is leased from the State Government.

Graziers make annual rent payments to the Government based on the unimproved value of the property.

AgForce is surveying members on the impact of increased rents.

Mr Walker says increased land valuations do not equate to higher farm profits and some graziers may not cope.

"If things don't change and unimproved values continue to rise at the rate they have over the last four or five years, we're looking at increases in rent past 2017 of over 1,000 per cent in some instances," he said.

"That is going to be unsustainable - people have told us that if it goes to that figure, they will walk away because it will make their businesses unviable.

"We need to look at what's happening in other states in places like New South Wales and even looking as far afield as New Zealand.

"This is going to be a long process but it needs information, it needs data and it needs both Government and industry to both fully understand that if we don't do anything by 2017, this is what the outcome is going to be."

However, the State Government has rejected claims that farm profitability is under threat because of rising leasehold rents.

Natural Resources Minister Rachel Nolan says pastoral rents are realistic and it is a stretch to suggest they are affecting the viability of farmers.

"About 40 per cent of the state is under pastoral lease and the state recovers only about $25 million a year in rent on that vast, vast area.

"Nobody is asking farmers to pay a genuine commercial rate.

"But I don't think it is unreasonable that a reasonably small group of people who have essentially exclusive access to around 40 per cent of the state should pay - at this stage 0.5 per cent a year of that value - to the rest of us as taxpayers in rent."